Gelston was married to Pheobe Mitchell (1753–1836). Together, they were the parents of: • Pheobe Gelston (1771–1836), who married Nicoll Floyd, the son of
William Floyd. who was a member of the
New York State Assembly and who served as president of the
Bank of the Manhattan Company. It was during 1792, that
Charles Willson Peale was commissioned by Gelston, a notable American during the time, to paint a "head size" portrait of Gelston as well as a companion piece of his wife and daughter. This painting is currently displayed at the
La Salle Art Museum. Gelston died on August 21, 1828, in New York City. He was buried in the First Presbyterian Church Cemetery in New York. ==References==